How do I know I'm using kubuntu?

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http://askubuntu.com – I installed Kubuntu image long time ago, and did several release upgrades since that. I have package kubuntu-full installed, and boot into KDE. Currently it looks like I'm using ubuntu: ~: lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 13.10 Release: 13.10 Codename: saucy There's not a single kubuntu word in my /etc/apt/sources.list, or is it Kubuntu = Ubuntu - Unity + KDE now? For example there's a Pre-Alpha Ubuntu Thar already, but no Kubuntu one. Would I get Kubuntu Thar, by installing Ubuntu Thar in the way mentioned above? P (HowTos)